Take

Generated from the engine's own definition: compute-engine's symbol, which we neither extend nor document by hand.

Return n elements from a collection.

✓ checked against that system · ! checked, with disagreements (hover a chip)Wolfram LanguageTake!↗

Take((xs: T, count: number) -> T where T: string) & ((xs: indexed_collection<T>, count: number) -> list<T> where T)as compute-engine declares it

Typed signatures

Type	Package	Applies
((xs: T, count: number) -> T where T: string) & ((xs: indexed_collection<T>, count: number) -> list<T> where T)	compute-engine	always

Domain: Compute engine

Examples

3 more kept as data, checked against the oracles

Basic #

The first four elements

live ↗

In$\mathrm{Take}(\bigl\lbrack a, b, c, d, k, f\bigr\rbrack, 4)$Out$\bigl\lbrack a, b, c, d\bigr\rbrack$

A negative count takes from the end

live ↗

In$\mathrm{Take}(\bigl\lbrack a, b, c, d, k, f\bigr\rbrack, -3)$Out$\bigl\lbrack d, k, f\bigr\rbrack$

Scope #

Taking from the first level of a matrix keeps whole rows

live ↗

In$\mathrm{Take}(\bigl\lbrack\bigl\lbrack11, 12, 13\bigr\rbrack, \bigl\lbrack21, 22, 23\bigr\rbrack, \bigl\lbrack31, 32, 33\bigr\rbrack\bigr\rbrack, 2)$Out$\bigl\lbrack\bigl\lbrack11, 12, 13\bigr\rbrack, \bigl\lbrack21, 22, 23\bigr\rbrack\bigr\rbrack$

UpTo takes at most that many, so no error

live ↗

In$\mathrm{Take}(\bigl\lbrack a, b, c\bigr\rbrack, \mathrm{UpTo}(4))$Out$\bigl\lbrack a, b, c\bigr\rbrack$

Properties #

A longer list truncates at 4

live ↗

In$\mathrm{Take}(\bigl\lbrack a, b, c, d, k, f, g, h\bigr\rbrack, 4)$Out$\bigl\lbrack a, b, c, d\bigr\rbrack$

Possible issues #

Negative one gives just the last element

live ↗

In$\mathrm{Take}(\bigl\lbrack a, b, c, d, k\bigr\rbrack, -1)$Out$\bigl\lbrack k\bigr\rbrack$

About

Examples	9
Checked against	Wolfram Language 7 agree2 differ
Crosswalk	Wolfram Language